Help me decide between John Deere 650 and 750

Both tractors I'm looking at are priced about the same, both have under 1000 hours and both look to be about the same condition (750 is a little rougher looking just due to some rust). I am mostly going to be using a finishing mower to mow my lawn and might get a tiller to turn up a garden. Other than that, it will just be used to maybe haul a load of firewood here and there. I feel like I don't need the big 650, but should I go with the 750 just in case? The only positive I see is that the 750 has 4WD, but the 650 has a lot less cosmetic issues. Thoughts?